Signal Strength; Using At Commands To Check Network Registration And Roaming Status - Multitech MultiModem iSMS SF100-G Administrator's Manual

Signal Strength

Signal Strength Command
To View Strength
For the SF400/800 models without signal LEDs, signal strength can be determined by using the following AT command:
AT+CSQ. This command is the default setting on the Network Setup > Cellular Modem window. This works for the SF100
as well.
AT Command Response Example
+CSQ: xx (For xx, see the values chart below)
Signal Strength Reference Table
The following table lists the meaning of the xx values in the signal strength response and explains how they correspond to
the number of LEDs lit for signal strength.
AT+CSQ Values
0 to 6
7 to 14
15 to 23
24 to 31
99
SF100 Signal Strength LEDs

Using AT Commands to Check Network Registration and Roaming Status

Use this command to verify that the cellular modem has been registered on a wireless network.
In the command window, type AT+CREG?
1.
The modem responds in one of the following ways:
2.
Value
+CREG: 0,0
+CREG: 0,1
+CREG: 0,5
Note: If the modem indicates that it is not registered, verify the signal strength to determine if the problem is the
strength of the received signal.
23
Signal Strength
Very weak signal
Weak signal
Stronger signal
Strongest signal
Signal not detectable
Network Registration Verification
Network Registration Status
The modem is not registered on any network
The modem is registered on the home network
The modem is registered on a network and it is roaming
Chapter 2 – Getting Started
SF100 Signal LED Bars
No LEDs lit
1 Bar LED is lit
1 Bar and 2 Bar LEDs are lit
1 Bar, 2 Bar, 3 Bar LEDs are lit
No LEDs lit
MultiModem® iSMS Administrator's Guide